Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bac97b1d1b9ee06…

MALICIOUS

PDF

71.9 KB Created: 2021-03-11 04:26:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 96b7267c72bfa3028633a453f04d4fb7 SHA-1: c205c851034363bb713c7e148eacde37540a39a5 SHA-256: 7bac97b1d1b9ee06a36729ec3994783fbbdf8213a89c3fe57a740bb79c071c95
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a mass of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/wix?keyword=geometry+transformation+composition+worksheet PDF link annotation
    • https://cdn.sqhk.co/wozepefiga/dFigia0/43797958113.pdfIn PDF document text
    • https://xadonuxezi.weebly.com/uploads/1/3/4/1/134131919/vimasipi-jebukokiteju-fozowe-wululuzuwoxit.pdfIn PDF document text
    • http://roxaresasupuke.iblogger.org/vegetable_oil_chemical_compound.pdfIn PDF document text
    • https://forajezar.weebly.com/uploads/1/3/4/1/134108615/f673f84b7c.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/120423819.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/17547604865.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/jeZhgjb/hockey_kevin_rodrigues_deck.pdfIn PDF document text
    • http://kafujaguvo.mygamesonline.org/bakaruvudemijofu.pdfIn PDF document text
    • https://gakikodokuni.weebly.com/uploads/1/3/1/8/131857060/nepopire.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/jeVhaih/death_from_above_airborne_motto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_00e8d148f07540eab2298b160f8f2ec3.pdf?index=trueIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_92a51acec3f142ebb64007882bf08a9c.pdf?index=trueIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_dc26f44dd24a417caed43deb4d01d25c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e81f0198-8463-4c12-9482-06a8143455d5/niduvelig.pdfIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_ce916fdec7d64520a64ede9fdff67f30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04005f6-e628-4541-a3e7-45dbdccdce1f/the_elite_kiera_cass_characters.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_8824076146e9476bb59a100ce817964b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ba417e-b650-461b-915e-06fddadf1d9d/jedazud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1ff7fd-49a1-40ea-a758-82f8101e2414/xotirowixifisazeme.pdfIn PDF document text
    • http://tititogejeda.rf.gd/xaguvefelumumojatifo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 5512 bytes
SHA-256: d0534a6362733a7c6d1f9a731e5623f665197757eec167ee7d75605742494c63
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 9972 bytes
SHA-256: a24fe5356beed76d708bdd673c0dff75106413f366a1f8d44cbf7eea9c9d9f97